Lug chuck for rock drills



June 29 1926.

. L. C. BAYLES m- AL LUG CHUCK FOR RObK DRILLS Filed May 2. 1922 mam June 29,1926.

UNITED 4 STATES .7 1, 9 ,222 PATENT OFFICE;

LEWIS GONDICT BAYLES AND FRED M, SLATER, OF EASTON, PENNSYLVANIA, AS- SIGNOItS TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A COB- IPOBA-TION OF NEW JERSEY.

the canon FOB aocx pa nts.

This invention relates to fluid actuated rock drills of'the hammer type, but more particularly to a lug chuck for such machines adapted to receive lug steel. and in a part, rotation thereto.

.The objects of theinvention are to simplify and strengthen the chuck, enable the parts of the chuck to be readily assembled in V the machine and disassembled, and produce 10 aconstructionin which wear and breakage are reduced to aminimum.

Our improved lug chuck is capable of use with any form of automatic rotation, in

which -a chuck sleeve is rotated, for imparts ing rotation to the drill steel having. lugswhich engage a chuck driver, but in the present instance, we have chosen to show a chuck having a gear adapted to be rotatedbroken away and partly in longitudinal secv tion of. the chuck sleeve,

' Figure 4 is a transverse sect onal view on the lme 4-4 of Figure 1 looking in the direction of thearrows,

F1 5-'is a transverse sectional view on 85 the line 5-.-5 of Figure 1, looking in the di 7 rection of the arrows.

- Referring to the drawings, A -represents the cylinder of a fluid actuatedrock drill 1 of the hammer type, having the reci rocating hammer piston B adapted to exten through the front cylinder washer G and im artv 3 blows of impact to the shank not the steel E having the lugs F.

- The chuck partsare contained within the .front head G and include the chuck sleeve H adapted to. be rotated as by means" of the gear J and impart rotation to the drill steel b means of thedriver K, which is .rform'e with a recessed ortion K", into 5 which the lugs F of the rill steel extend.

The chuck sleeve His rovided at its forward end with clutch aws Land a re-,

- movable cylindrical chuck bushing 0 formed with smooth unbroken .end faces and without provided with clutch jaws R cooperating forms a bearing and chuck sleeve and may be renewed if neces- Salty,

Application filed m 2, 1922. serial 1%. 557,963.

jaws is located within the forward end of the sleeve H and seated against an internal shoulder P on said sleeve. The shank D of the drill steel extends through and is guided in the chuck bushing O in position to receive the'impact blows of the hammer piston B. The clutch jaws L'on the chuck sleeve H as indicated particularl in Figure 3- preferably extend forwardly beyond the end Q, of the chuck bushing O, and the driver K is 05 with the clutch jaws L The driver K as sho is also provided with internal lugs S which are adapted to impart rotation to the drill steel and are preferably formed in alignment with and as a part of the driver clutch. jawsQand terminating at the outer ends of said driver clutch jaws R. The forward end Q of the chuck bushing O is pref erably beveled as indicated in the figures, in order to. receive the beveled surface of the lugs F on the drill steel, andthe forward -.end of the recessed portion K is beveled at 9 toform an abutment for the drill steel ugs. v

In accordance with-our invention, so far described, the removable .chuck bushing O ide for the shank of the drill steel and the bushingprotects the without replacing the entire chuck sleeve. The integral shoulder P, within the I chuck sleeve H resists the rearward thrust and im act of the steel at times against the chuck ushing O and form's a simple and strong .construction. By extending the clutch jaws L of the chuck sleeve H forwardly beyond the end of the chuck bush-- ing 0, the lugs S on the driver K may be formed in alignment with the clutch jaws R on the driver, and asim le and strong "con-- struction is thus provide at this point. As shown, the' driving lugs S..are adapted to seat against the periphery of the outer end of the chuck bushing O. r I

We claim: y 1. A lug ehuck\for fluid actuated rock drills of the hammer. type, comprising a chuck sleeve adapted to be rotated and having clutch 'aws at its forward end, a removable cyiindrical chuck bushing formed with smooth unbroken end faces and seated withinthe forward end ofsaid sleeve against an internal integral shoulder on said sleeve,

the shank of the drill steel being adapted ,to bushing terminating at the base of the lugs extend through the chuck bushing 1n posion the chuck sleeve, the shank of'the drill tion to receive the impact blows of the steel being adapted to extend throu h the 25 hammer piston of the machine, a driver chuck bushing in position to receivet e imhaving clutch jaws cooperating with the pact blows of the hammer piston of the maclutch jaws at the forward end of the chuck chine, a driver having clutch jaws coopersleeve, said driver also being formed with a ating with the clutch jaws at the forward recessed portion into which the drill steel end of the chuck sleeve, said driver also be- 80 iugs are adapted to extend, and driving ing formed with a recessed ortion into lugs for engaging the drill steel lugs within which the drill steel lugs are a apted to exsaid recessed portion of the driver and tend, and driving lugs for engagin the adapted to seat against the periphery of the drill steel located within said recesse' porouter end of the chuck bushing. tionv of the driver and terminating at the. 85 2. A lug chuck for fluid actuated-rock outer ends of the driver clutch jaws, wheredrills of the hammer type, comprising a by the said driving lugs are adapted to seat chuck sleeve adapted to be rotated and havagainst the periphery of the outer end of ing clutch jaws at its forward end, a rethe chuck bushin i movable cylindrical chuck bushing formed In testimony whereof we have signed this 40 with smooth unbroken end faces and seated specification. within the forward end of said sleeve against an internal integral shoulder on said sleeve, LEWIS CONDICT BAYLES.

the forward unbroken end of the chuck FRED M. SLATER. 

